User guide

Configuring the Speed/Voltage Loop
5-3
5.2 Configuring the Speed Loop Feedback
Feedback can come from the armature voltage or from an encoder or tachometer. The
parameters you need to configure depend on which feedback source you are using,
as set by
FEEDBACK SELECT
(P.200).
5.2.1 Configuring Armature Voltage Feedback
If
FEEDBACK SELECT
is set to armature voltage, the drive reads the internal armature
voltage and scales it with the
MOTOR RATED ARM VOLTS
,
ARM VOLTAGE GAIN
, and
ARM
VOLTAGE ZERO
parameter values. These values are summed together to produce the
armature voltage signal. The armature voltage block is shown in figure 5.2.
FEEDBACK SELECT
(P.200)
Selects the type of
feedback signal that
is used for the
speed/voltage loop.
Parameter Range:
ARMATURE VOLT
DC
TACH
PULSE
TACH
AC
TACH
Default Setting:
ARMATURE VOLT
Parameter Type:
Configurable
OIM Menu Path(s):
Speed/Voltage Loop (
SPD
) - Speed Voltage Loop
(
SPD
) Feedback
Quick Start
PULSE TACH
and
AC TACH
can only be selected if the appropriate kit is installed
(Pulse Encoder kit or AC Tachometer Feedback kit).
NEGATIVE CURRENT LIM
(P.006) is set to 0 and
REVERSE DISABLE
(P.015) is set
ON
if:
•
AC TACH
is selected.
•
PULSE TACH
is selected and
PULSE TACH QUADRATURE
(P.208) is set to
OFF
.
!
ATTENTION:
The incorrect configuration of this parameter can cause an
overspeed condition. This parameter must be configured by a qualified
person who understands the significance of setting it. Failure to observe
this precaution could result in bodily injury.
Figure 5.2 – Armature Voltage Block Diagram
To Figure 5.1, Speed
Loop Block Diagram